MCQs of Automatic Generation and Voltage Control (Power System Operation and Control - 2180909)

Power System Operation and Control (2180909) MCQs

MCQs of Automatic Generation and Voltage Control

Showing 1 to 10 out of 24 Questions

Turbine speed governing system consists of

(a)	Flyball speed governor
(b)	Hydraulic amplifier and Linkage mechanism
(c)	Speed changer
(d)	All of above

In fly ball speed governor, The increase in speed results in

(a)	Fly ball move outwards
(b)	Fly ball move inwards
(c)	Fly ball remain in same position
(d)	None of above

Hydraulic amplifier consists of

(a)	Pilot valve
(b)	Main piston
(c)	Both a and b
(d)	Steam valve

The function of speed changer is

(a)	Change the speed of governor
(b)	Limit the speed of governor
(c)	Steady state power output of turbine
(d)	All of above

Model equation of speed governor system is (if

K_{s g}

= Gain of speed governor,

T_{s g}

= Time constant of speed governor)

(a)	$\frac{K_{s g}}{1 - T_{s g} s}$
(b)	$\frac{T_{s g} K_{s g}}{1 + T_{s g} s}$
(c)	$\frac{K_{s g}}{1 + T_{s g} s}$
(d)	$\frac{K_{s g}}{T_{s g} s}$

Time constant of turbine is lies between

(a)	0.2 to 2.5 sec
(b)	0 to 1 sec
(c)	1 to 2 sec
(d)	Depends on turbine design

The relationship between the steady state change in frequency with respect to change in load is

(a)	$- (\frac{B}{B + \frac{1}{R}})$
(b)	$- (\frac{1}{B + \frac{1}{R}})$
(c)	$- (\frac{R}{B + \frac{1}{R}})$
(d)	None of above

250 MW machine with an operating load of 125 MW. Let the change in load be 1% for 1% change in frequency (scheduled frequency = 50Hz) then B is equal to

(a)	0.05 pu MW/Hz
(b)	0.01 pu MW/Hz
(c)	0.1 pu MW/Hz
(d)	None of the above

Two alternators rated 200 MW and 400 MW are operating a parallel their governor droop characteristics are respectively 4% and 5% from no-load to full load. At no-load the system frequency is 50 Hz. When supplying a load of 600 MW, the system frequency will be

(a)	50 Hz
(b)	49 Hz
(c)	51.3 Hz
(d)	47.7 Hz

10.

A 250 MW, 50 Hz turbine generator set has a speed regulation of 5 percent based on its own rating. If the generator frequency decreases from 50 Hz to a steady state value of 49.7 Hz with the speed changer setting unchanged. Determine the increase in the turbine power output

(a)	35 MW
(b)	30 MW
(c)	25 MW
(d)	45 MW

Showing 1 to 10 out of 24 Questions